Events and Listeners: Decoupling Application Logic

As applications grow, placing all logic in controllers becomes messy. Events help separate concerns. Example: When a user registers: - Send welcome email - Create profile - Notify admin All without cluttering the controller. ## Create event and listener ```bash php artisan make:event UserRegistered php artisan make:listener SendWelcomeEmail --event=UserRegistered ``` ## Fire event ```php event(new UserRegistered($user)); ``` ## Listener handle ```php public function handle(UserRegistered $event) { Mail::to($event->user->email)->send(new WelcomeMail()); } ``` ## Event flow ```mermaid flowchart TD A[Action Occurs] --> B[Event Fired] B --> C[Listener 1] B --> D[Listener 2] B --> E[Listener 3] ``` Events make large systems easier to extend. In the next tutorial, we will move heavy work into background queues.